Le Chatelier's Principle

Given the equation representing a reaction:
N₂O_4(g) ↔ 2NO_2(g)

Which statement describes this reaction at equilibrium?

• The concentration of N₂O₄(g) must equal the concentration of NO₂(g).
• The concentration of N₂O₄(g) and the concentration of NO₂(g) must be constant.
•  The rate of the forward reaction is greater than the rate of the reverse reaction.
• The rate of the reverse reaction is greater than the rate of the forward reaction.

Tags

NGSS.HS-PS1-6

Which of the following is NOT true at equilibrium?

• The forward and reverse reactions proceed at the same rate.
• The concentrations of reactants and products do not change.
• The concentration of the reactants is equal to the concentration of the products.
• The forward and reverse reactions continue to occur.

Tags

NGSS.HS-PS1-6

An equilibrium constant with a large magnitude indicates…

• A very fast reaction
• More products at equilibrium
• More reactants at equilibrium
• nothing, without considering the stoichiometry of the reaction

Tags

NGSS.HS-PS1-6

Le Chaltelier's Principle states that if a chemical system at equilibrium is stressed,

• the system will adjust to increase the stress
• the system will adjust to reduce the stress
• the system will not adjust

2 SO₂ (g) + O₂ (g) ⇌ 2 SO₃ (g)

Removing O₂ (g) will

• shift equilibrium right

• shift equilibrium left

• decrease temperature

• have no change

2 SO₂ (g) + O₂ (g) ⇌ 2 SO₃ (g)

Adding SO₂ (g) will

• shift equilibrium right

• shift equilibrium left

• increase rate of reaction

• have no change

2 SO₂ (g) + O₂ (g) ⇌ 2 SO₃ (g)

Removing SO₃ (g) will

• shift equilibrium right

• shift equilibrium left

• increase pressure

• have no change

2 SO₂ (g) + O₂ (g) ⇌ 2 SO₃ (g)

Increasing volume of container will

• shift equilibrium right

• shift equilibrium left

• slow rate of reaction

• have no change

2 SO₂ (g) + O₂ (g) ⇌ 2 SO₃ (g) is an exothermic reaction.

An increase in temperature will...

• shift equilibrium toward the right

• shift equilibrium toward the left

• increase pressure

• have no change

A_(g) + B_(aq) ↔ C_(s) + D_(s)

ΔH= 240 kJ/mol

If the volume increases, then the reaction will shift to the _____.

• left

• right

• stays the same

• Up